JPH0241575U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの考案の各部波形図、第２図はこの
考案の一実施例を示すビデオテープレコーダの記
録系のブロツク図、第３図は第２図の各部信号波
形図、第４図は従来のビデオテープレコーダの記
録系のブロツク図、第５図は第４図の複合映像信
号の波形図、第６図は第４図の各部信号波形図、
第７図はダビングをするためのビデオテープレコ
ーダのブロツク図である。 図において、１はビデオテープ、２はヘツド、
３はＦＭ変調器、９は複合映像信号、１０はＡＧ
Ｃ装置、１２は同期信号、１５は制御増幅器出力
、２１は垂直同期分離器、２３は加算器、２４は
出力、２５は出力信号、２７はレベル補正器、２
９は入力、３０はＡＮＤゲートを示す。なお、図
中、同一符号は同一、または相当部分を示す。 Fig. 1 is a waveform diagram of each part of this invention, Fig. 2 is a block diagram of a recording system of a video tape recorder showing an embodiment of this invention, Fig. 3 is a signal waveform diagram of each part of Fig. 2, and Fig. 4 is a diagram of signal waveforms of each part of Fig. 2. A block diagram of the recording system of a conventional video tape recorder, FIG. 5 is a waveform diagram of the composite video signal of FIG. 4, FIG. 6 is a waveform diagram of each part of the signal in FIG. 4,
FIG. 7 is a block diagram of a video tape recorder for dubbing. In the figure, 1 is a videotape, 2 is a head,
3 is an FM modulator, 9 is a composite video signal, and 10 is an AG
C device, 12 is a synchronization signal, 15 is a control amplifier output, 21 is a vertical synchronization separator, 23 is an adder, 24 is an output, 25 is an output signal, 27 is a level corrector, 2
9 indicates an input, and 30 indicates an AND gate. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 少なくとも１つ以上の垂直同期信号パルスの復
帰レベルを白レベル付近とする同期信号修正手段
を持つことを特徴とするビデオテープレコーダ。 A video tape recorder comprising synchronization signal modification means for adjusting the return level of at least one vertical synchronization signal pulse to near a white level.